Electrically operated pump jack



June 2, 1942. "w. B.1-'HIEMANN 2,284,932

ELECTRICALLY OPERATED PUMP JACK Filed Jan. 15, 1940 4.1 I Mel ($01" Patented June 2, 1942 l 2,284,932 ELECTRICALLY OPERATED PUMP JACK William B. Thiemann, Albert City, Iowa Application January 15, 1940, Serial No. 313,907

3 Claims.

The object of my invention is to provide a simple durable and inexpensive pump jack particularly adapted to be operated by means of a small electric motor.

A further object of my invention is to provide an improved pump jack which is silent in its operation and provided with means for balancing the Weight of the pump rod, wherein a more uniform load will be applied to the electric motor.

A further object is to provide an improved pump jack, including a pair of crank elements and lift bars connected therewith in such a manner that the lift bars are operated on opposite sides of the pump by cranks driven by belts from a single jack shaft, and in connection therewith an independent belt tightener for each of said belts wherein a maximum amount of power may be transmitted through the belts with a minimum amount of slippage.

A further object is to provide in a pump jack employing a pair of upright lift bars connected to the upper end of a pump rod and employing a crank mechanism set to one side of the pump stock, an improved anti-friction device for carrying the pressure side of the pump rod as the lift bars are operated to lift said rod.

My invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the accompanying drawing, in which:

Figure 1 is a side elevation of my improved pump jack showing the manner in which it is applied to a pump;

Figure 2 is an end elevation of same;

Figure 3 is a top plan View of my improved pump jack, a portion of which is shown in section on the line 33 of Figure 1;

Figure 4 is an enlarged detail sectional View taken on the line 44 of Figure 1;

Figure 5 is an enlarged detail sectional view taken on the line 55 of Figure 2.

On the drawing I have used the reference numeral H! to indicate a pump stock and II a guide supporting bracket for slidably supporting the upper end of the pump rod l2, said pump rod being of the ordinary construction.

My improved pump jack comprises a supporting bar I3 having at one end a vertically arranged leg l4 and at the other end a clamp device l5, said clamp device l5 being designed to secure one end of the frame member l3 to the pump stock l0 in a detachable manner. Fixed to the inner end of the member I3 is a pair of bearings IS in which is rotatably mounted a crank shaft l1. Each end of the shaft H is provided with a belt wheel l8, each of said wheels including spokes l9, one of said spokes being provided with a wrist-pin 2!). Pivotally connected to each of the pins is an upright lift bar 2| mounted outside of the wheels 3, and on opposite sides of the pump stock I l and the bracket l, as clearly illustrated in Figure 2.

Connected to the upper ends of the bars 2| is a cross bar 22 having atone side a' laterally projecting bracket 23 which provides means for con? necting the end of the lift bars 2! to the pump rod l2 by means of a pin 24. By this arrangement it will be seen that if the wheels l8 are rotated, then the bars 2i will be elevated and lowered, causing the pump rod i2 to .be elevated and lowered.

For counter-balancing the weight of the pump rodlZ I have provided on the upper ends of the guide bracket a cross bar 25 which is detachably secured thereto by means of bolts 37 projecting through a bar 21 supported on the'opposite side of the bracket H in the manner clearly illus-' trated in Figure 4. Each end of the bar 26 is provided with a hook 28 for supporting the upper ends of springs 29, the lower ends of the said springs 29 being secured to pins 30 carried by the lift bars 2 I, said springs thus providing means for balancing the weight of the rod l2, the tension of the said springs 29 being adjusted by simply elevating and lowering the bars 25 and 21 relative to the guide bracket ll.

Adjustably fixed to the outer face of the bar 2! is a pair of bracket members 3| by means of the bolts 26in slots 21a, said brackets 3| being mounted on opposite sides of the pump rod l2 and having supported between their outer ends a roller 32 by means of a bolt 33, said roller 32 being designed to engage the outer edge of the bar I2 and serve as an anti-friction device at the time power is applied to the rod l2 to lift the same. This roller 32 provides means for relieving the guide 34 of undue wear, the said guide 34 being a part of the ordinary pump construction.

For rotating the wheels I8 I have provided on the outer end of the bar l3 bearings 35 in which is rotatably mounted a jack shaft 36. Each end of the shaft 36 is provided with a belt pulley 31 in alignment with corresponding belt wheels l8, the pulley 31 being adapted to receive V belts 38 which are adapted to operate over the flat belt wheels l8. A belt tightener pulley 39 is provided for each of the belts 38, said pulleys 39 being mounted on a pivoted lever 40 carried by a post 4|. A spring 42 provides means for yieldably applying pressure to the idler pulley 39 and to the belts 38. Thus means is provided for independently supplying tension to each of the belts 38. A belt wheel 42 is also fixed to the shaft 36 and is driven by a belt 43 and by an electric motor 44, said motor 44 being mounted on the upper end of a pedestal 45 carried by the upper edge of the frame member l3.

By this arrangement it will be seen that the belt 43 may be driven by means of the motor 44, which in turn will cause the wheel 42 to rotate,

and with it both of the bars 31, both belts 38 and both of the wheels [8, and with .themtthe shaft H which is fixed to both of said wheels 18. R0.- tation of the wheels l8 will cause both of the lift bars 2| to be elevated in unison, and in turn the,

bar 22, causing the rod 2 to also be elevated as the wheels l8 are rotated through an angular path of 180. Tension will be applied to the springs as the lift bars are moved downwardly through further l80"- of rotation'of said wheels, thus providing means whereby a more uniform and even load will be applied-t0 the belts 38 and in turn ,to the motor 44 which usually employs a very small light armature, thus providing means whereby the motor will rotate more uniformly, and inasmuch as fall ,of the speed rotation is through belts, the noise is eliminated to a minimum; the;belt' tightener 39-providing means for taking-up slack in the belts each time that excessive loads are applied to said belts.

Thusit will be seen: I have'provided a pump jack of very simple construction wherein the a shaft I! is located. near the stock ll! so that a very small amount of angular strain is applied to the pump rod on the lifting stroke, the pulley 32 serving asan.anti-friction;device to carry this small amount-of angularstrain as applied to said rod.. By providing two lift rods 2| OI'I'ODPOSitB sides .of the pump,.lateral. strain applied to the sides of the lift rod .l2 will be eliminated. The pulley 32' isadjustably mounted in the brackets 3| by meansofslots45 in .which the bolt 33 is mounted, .so, that thesaid pulley 32 may always be held in contact with the edge of the said rod I claim as .my invention:

1; In combination, a pump stalkhaving at its.

upper. end a pair: of upwardly extending guide supporting brackets, .a horizontal supporting bar, a clamp at one end of'..said bar.:for .detachably securing. saidbar to saidpump. stalk, a .leg sup porting theother endofxsaid supporting bar, a

transverse shaft at each end of said bar, flexible means for operatively connecting said shaft, an upright pedestal carried by said supporting bar intermediate its ends, a motor platform carried by said pedestal, flexible means transmitting power from said motor to one of said shafts, a pair of lift bars, means for operatively connecting said lift bar to the other one of said shafts to impart reciprocating motion thereto, an upright post on each side of said leg, means carried by the upper end of each of said posts for tightening the first said flexible means, means for operatively connecting said lift bars to the upper end of the pump rod carried by said stalk to operatethe horizontal clamping bars, means adjustably clampingsaid bars to said brackets, a

' pair of laterally projecting and spaced bracket members adjustablysecured to one of said clamping bars to move toward and from each other, a roller between the outer ends of said bracket members; and means adjustably mounting said roller in said-shaft members to move toward and from said'bars substantially as described, for the purpose stated. 7

2. In a device of the class described, the combination of a pair of 'upright supports having a pump guide at their upper ends, horizontal clamping bars, means-adjustably clamping said bars to said supports l-to slide longitudinally thereof, a pair of laterally projecting and spaced brackets 'adjustably secured to one of said clamping-bars to move toward and from each other, a roller between theouter ends of said brackets, and means adjustably mounting said roller in said brackets to move toward and from said bars substantially as described and for the purpose stated.

3. In'a-pump jackethaving at its upper end a pump rod guide carried by upright supports, a pump rod slidablymounted in said guides operatedby-mechanically'actuated lift bars, said lift bars being operated-ina line-of movement at an anglerelative to the -line of movement of said pump rod, an anti-friction device for carrying the lateral pressure imparted to the rod by said angular movement, comprising a clamping bar, means adjustably securingjsaid. bar to said guide supports tomove longitudinally thereof, a bracket on each side of said rod adjustably se- "cured to said clamping bar to move toward and from each other; a roller between the outer ends of said brackets adapted-to engage the pressure side. of said-rod, and means adjustably and pivotally mounting said roller in said brackets.

WILLIAM B. THIEMANN. 

